Manufacture of liquid glue



umrso "STATES nonALn x. TnEssLEn, or PITTSBURGH, PENNSYLVANIA, ASSIGNOR To HAMOR, OF PITTSBURGH, PENNSYLVANIA.

PATENT owes.

WILLIAM A.

mnnurgcrunner- LIQUID GLUE.

No Drawing.

To all whom it may concern: I

Be it known that I, DONALD K. TRESSLER, a citizen of the United State residingat Pittsburgh, in the county o Allegheny,

. State of Pennsylvania, have invented certain new and usefulImprovements in the r Manufacture of Liquid Glue; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same. l

This invention relates to an improved liquid glue made from animal glues.

Ordinary animal glues, such as hide and bone glues, do not dissolve in cold water, but

merely swell. They dissolve in hot water to form viscous, colloidal solutions, and are ordinarily used as adhesives in this form,

; 6., in the form of hot aqueous solutions. When these hot solutions cool much b'elow,

100 F., they gelatirnze and form tough jel lies. Ordinary animal glues, therefore, are not adapted for use with cold water,-or when their solutions in hot water are cooled to ordinary temperatures It has been known for some time that the presence of relatively large amounts of various substances in glue solutions prevent the formation of tough jellies when the glue solutions are cooled, and it has been proposed to prepare liquid glues by adding such substances to hot glue solutions; but liquid glues so prepared have not, so far'as I am aware, proven satisfactory,fduefto instability, diminution of adhesiveness with age,

"iweakening, on humid days, of gluedjoints made with such glues, etc. Certain of the substances Which-it has. been .proposed to 40 add to glue solutions to prevent the formation of jellies are also prohibitive in price or impart an offensive odor or poisonous properties to the glue or destroy its stability and strong adhesive properties. Among the substances which it has thus been proposed toincorporate with hard glue solutions in r i f order to make. liquidglue, is sodium salicylate, but the resulting glue has the objec;

tion, among others,'thatn joints made with it will weaken in dampv weather.

, As theres'ult of an extended and diligent investigation of the action of a large number of substances on gluesolutions, I have I found that a new li uid glue having remarkable properties, an free from objections of bone or hide glue.

erties, and sets quickly and dries readily to diluted with water to practically any desired Specification of Letters Patent. 7 Patented Oct. 25, 1921- Application m December 6, 1920. Serial No. 428,482.

'. pared by compounding an alkaline earth salicylate with hot solutions of ordinary I have found that glue solutions containingupward of about ten per cent. of an alkaline earth salicylate do not gelatinize when cooled to ordinary room temperatures and are powerful adhesives, possessing remarkable properties. o

Among the properties and advantages characteristic of the new liquid glue of the present invention maybe mentioned the following :-It will remain liquid at ordinary temperatures for an indefinite period if kept in a tightly sealed container; it may be kept' practically indefinitely without danger of bacterial decomposition, owing to thepowerful antiseptic properties of the alkaline earth salicylate; it has superior drying propform a clear transparent film possessing great strength and tenacity; it has powerful adhesive qualities and joints made with it retain substantially their full strength in humid" weather; it adheres firmly to lass, wood and metal, and can be used to a vantage-for making joints of any of these materials; 'it canfbe used for the making of. half-tone copper plates for photo engraving i work; it can be dried and ground and the resulting dry glue re-dissolved in water at ordinary temperatures, in which it is completely soluble j-it can be thinned with 'cold water if it becomes too thick, and can be dilution without the formation of a jelly.

The salicylate which I have found particularly advantageous for-use inmaking the new liquid glue is magnesium salicylate. Other alkaline earth salicylates can, however, be used, particularly strontium salicylate or calcium'salicylate, although I regard the use of these latter salicylates as less advantageous. Owing to the powerful antiseptic properties of these salicylates, they impart improved keeping, qualities to the" glue and prevent danger of bacterial decomposition. 'The liquid glue can be further protected a ain'st thegrowth of molds onits surface y adding a small amount of a suitable material, for examp e," about one part ofartificial oil of campho or an equal amount of some other essential'oil dissolved in an equal volume "ofdenatured alcohol to each 1000 parts of liquid glue.

The proportions of the ingredients are capable of considerable variation, and good results still obtained.

The invention will be further illustrated by the following specific examples of different methods of producing the newliquid g ue: Y

- I make a solution of magnesium salicylate .in hot water containing about 20% magne- As an alternative procedure, I may pro ced as follows :'I prepare a solutlon of hide or bone glue inhot water using about one-half "part of high gradehide glue to each part of water or about one, part of bone glue to each part of water. When the hard,

glue is nearly in solution, I add about one part by weightof magnesium salic'ylate for each five parts of water used and continue the stirring until all-of the materials are in solution. 1

Instead of making the new liquid glue from previously repared hard glue, I may make it directly rom the hide or bone stock withbut little change in the customary procedure used in the manufacture of hard glue. The glue liquor maya be prepared by the extraction of the hide or bone stock in the usual way. Hide glue liquor is evaporated until it contain about 40% of glue. Bone glue liquor is evaporated until it contains about 50% of glue. I then add about 12 parts of magnesium salicylate to each 100 parts of the glue solution and stir until the salicylate is entirely dissolved.

In the speclfic procedures above described the proces of manufacture is carried out with the use of hot glue solutions, and such methods of procedure are more advantageous and are particularly to be recommended for purposes of commercial manufacture. The improved liquid glue composition can, nevertheless, be made, although less advantageously, if the several in edients are mixed together in the cold wit more or less stirring, and for a suflicient length of time. Ifa' ground lue; is employed, the process will ordinaril y require several "hours, for

pglrltof bone glue for each part animal example, six or eight hours, while if flake glue or gluein large lumps is used,,a much longer time may be necessary. Owing to the long period of time required for producing the liquid glue composition with the use of cold water, this method is less economical,

' and I regard the metlrods of manufacture which make use of hot water as the preferred and more advantageous methods of procedure. 66

The resultin liquid lue, produced as above describe has the desirable ropertie above mentioned, and is availa le for use where a liquid glueflpossessing these I properties is desired. If clear, hard lues 7 are used in its manufacture, the rest tingv' 1 liquid .glue will be transparent and suitable for use, for example, in the prepara tion of copper half-tone photo engraving plates, as a very excellent enamel is formed when a thin film of this glue is carefully heated.

As above mentioned, the liquid glue is capable of dilution with cold water, if its consistency is too thick, while the glue can be dried and ound and thus prepared in a comminute state for hipment, etc., and the dry powder can be readily dissolved in cold water, whereas the original animal glue from whiclf it is produced is'insoluble in cold water.

It will thus be seen that the new liquid glue forms a valuable adhesive and ossesses properties which make it of particu ar value for use in the household and for other purposes.

I claim: 7

1. A liquid glue, comprising glue compounded with an alkaline earth salic'ylate. v

2. A glue .composition soluble in cold 96 water and containing animal glue and. an alkaline earth salicylate. I

3. A liquid glue comprising a solution of glue and an alkaline earth salicylate.

4. A liquid glue, comprising glue compounded with magnesium salicylate.

5. A glue composition soluble in cold water and containing animal glue and magnesium salicylate. l 10 a 6. A liquid glue comprising a solution of animal glue and magnesium salicylate.

In testimony whereof I afiix my signature.

DONALDK. TRESSLER. 

